Alloy and process of forming the same



Patented Nov. 2, 1926.

' Ltd-5, 332

BEST AVAlLABLE com UNITED STATES HARDY M. FREDRIKSEN, OF SEATTLE, WASHINGTON.

ALLOY AND PROCESS OF-FORMING' THE SAME No Drawing.

This invention relates to improvements in the composition of alloys to form a metal employed in electrical contacts and the object of this invention is to produce a metal 5 that will possess a high resistance to the electric spark in the form of points that constitute the terminals or electrodes used in igniters between which the electric spark leaps at time of break.

A further object resides in the provision of metal that cannot be electrically welded under any known process.

A still further object resides in the provision of metal that will prevent pitting of 5 the points insuring a smooth surface of the terminals at all times.

In carrying out this invention, I employ a sand or hard clay crucible into which equal proportions of copper and silver are subjected to the highest temperature obtainable until the mass has been melted. At this stage is added one (1%) percent of powdered graphite, and additional silver until the combined proportions are approximately twelve (12%) percent copper, one (1%) percent graphite and eighty-seven (87 percent silver.

Application filed August 2, 1923. Serial No. 655,204.

This mass is maintained in a state of ebullition until complete amalgamation is effected. Thereafter, it is permitted to cool so into a solid body.

These proportions, I find, give very satisfactory results; however, I do not care to be limited thereto.

Having thus described my invention, What 85 I claim as new therein and desire to secure by Letters-Patent, is:

1. The process of forming a metal employed in electrical contacts, which consists in subjecting equal parts of silver and cop- 4 per to a high temperature, thence adding one percent powdered graphite and seventyfive percent additional silver while in a state of ebullition to effect complete amal gamation.

2. In a metal employed in electrical contacts, the combination of eighty-seven (87%) percent silver, twelve (12%) percent copper, and one (1%) percent graphite, substantially as described.

Signed at Seattle, King County, )Vash ington, this 12th day of July, 1923.

HARDY M. FREDR-IKSEN. 

